[Java] Cara Cache Data Hasil Query dengan SpringMVC
Pada tulisan kali ini, saya coba membuat suatu metode caching untuk menyimpan data-data master kedalam memory, sehingga tidak perlu query ke database lagi. Hal ini cocok digunakan untuk menyimpan data-data master yang sangat jarang berubah, seperti kode provinsi ataupun kode cabang.
Okay, di tutorial ini saya menggunakan Spring MVC 4, Hibernate dan ehCache sebagai cache provider. Berikut adalah pom.xml yang digunakan,
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.edw</groupId>
<artifactId>mavenproject5</artifactId>
<version>1</version>
<packaging>war</packaging>
<name>mavenproject5</name>
<properties>
<endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>6.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- Spring 4 dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
<!--ehcache-->
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.5</version>
</dependency>
<!--hibernate-->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.3.8.Final</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<compilerArguments>
<endorseddirs>${endorsed.dir}</endorseddirs>
</compilerArguments>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.3</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.6</version>
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>copy</goal>
</goals>
<configuration>
<outputDirectory>${endorsed.dir}</outputDirectory>
<silent>true</silent>
<artifactItems>
<artifactItem>
<groupId>javax</groupId>
<artifactId>javaee-endorsed-api</artifactId>
<version>7.0</version>
<type>jar</type>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
Kemudian konfigurasi standard yang digunakan di SpringMVC, applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd">
<context:annotation-config/>
<tx:annotation-driven/>
<cache:annotation-driven />
<context:component-scan base-package="com.edw.mavenproject5.service"/>
<!-- datasource -->
<bean id="ds" class="org.apache.tomcat.jdbc.pool.DataSource" destroy-method="close"
p:driverClassName="com.mysql.jdbc.Driver" p:url="jdbc:mysql://localhost/test"
p:username="root" p:password=""
p:initialSize="10"
p:maxActive="50"
p:maxIdle="10"
p:minIdle="3"
p:maxWait="30000"
p:removeAbandoned="true"
p:removeAbandonedTimeout="30"
p:validationQuery="SELECT 1" />
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"
p:dataSource-ref="ds" p:configLocations="classpath:hibernate.cfg.xml" depends-on="ds">
<property name="hibernateProperties">
<value>
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.query.substitutions=true
hibernate.show_sql=true
hibernate.enable_lazy_load_no_trans=true
</value>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="cacheManager"
class="org.springframework.cache.ehcache.EhCacheCacheManager"
p:cache-manager-ref="ehcache"/>
<bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"
p:config-location="classpath:ehcache.xml"/>
</beans>
dan dispatcher-servlet.xml,
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:component-scan base-package="com.edw.mavenproject5.controller" />
<mvc:annotation-driven />
<mvc:default-servlet-handler />
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/jsp/"
p:suffix=".jsp" />
</beans>
yang kemudian dipanggil dari web.xml,
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
Nah, ada satu konfigurasi xml yang penting dalam membuat cache. Yaitu ehcache.xml, disana disimpan nama cache serta lama waktu hidupnya
<?xml version="1.0" encoding="UTF-8"?>
<!--
caching configuration
-->
<ehcache>
<defaultCache
maxElementsInMemory="5000"
eternal="true"
overflowToDisk="false"
memoryStoreEvictionPolicy="LRU"
/>
<!--2menit-->
<cache name="duaMenit"
maxElementsInMemory="10000"
timeToLiveSeconds="120"
memoryStoreEvictionPolicy="LRU"
/>
<!--1menit-->
<cache name="satuMenit"
maxElementsInMemory="10000"
timeToLiveSeconds="60"
memoryStoreEvictionPolicy="LRU"
/>
</ehcache>
Nah sekarang kita buat class java-nya, dimulai dari service layer. Perhatikan annotation Cacheable, konfigurasi tersebut adalah konfigurasi yang menandakan lokasi method yang kita cache.
package com.edw.mavenproject5.service;
import com.edw.mavenproject5.bean.Dosen;
import java.util.List;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service
@Transactional
public class DosenService {
@Autowired
private SessionFactory sessionFactory;
@Cacheable(key = "#root.methodName", value = "duaMenit")
public List<Dosen> getDosens() {
return sessionFactory.getCurrentSession().createCriteria(Dosen.class).list();
}
@Cacheable(key = "#root.methodName + #idDosen", value = "satuMenit")
public Dosen getDosen(String idDosen) {
return (Dosen) sessionFactory.getCurrentSession().get(Dosen.class, idDosen);
}
}
Yang kemudian dipanggil dari controller,
package com.edw.mavenproject5.controller;
import com.edw.mavenproject5.service.DosenService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class IndexController {
@Autowired
private DosenService dosenService;
@RequestMapping(value = "/", method = RequestMethod.GET)
public String index(ModelMap modelMap){
modelMap.put("dosens", dosenService.getDosens());
return "index";
}
@RequestMapping(value = "/get", method = RequestMethod.GET)
public String get(ModelMap modelMap, String id){
modelMap.put("dosen", dosenService.getDosen(id));
return "index";
}
}
Dan berikut adalah ui yang digunakan untuk menampilkan hasil query didatabase,
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
<c:if test="${not empty dosens}">
<table class="table table-hover table-striped">
<thead>
<tr>
<th>ID Dosen</th>
<th>Nama Dosen</th>
</tr>
</thead>
<tbody>
<c:forEach items="${dosens}" var="dosen">
<tr>
<td>${dosen.iddosen}</td>
<td>${dosen.namadosen}</td>
</tr>
</c:forEach>
</tbody>
</table>
</c:if>
<c:if test="${not empty dosen}">
<h1>Hello Dosen ${dosen.namadosen}!</h1>
</c:if>
</body>
</html>
Hasil akhirnya adalah sebagai berikut, data dengan kode 02 dan 321 sudah diubah secara langsung didatabase, namun walaupun browser di-refresh berulang kali, tetap menampilkan data yang lama, yaitu “Dodol” dan “Testing 123 123”.
Untuk sourcecode lengkapnya bisa diunduh di github, https://github.com/edwinkun/CachingWithSpringMVC. 
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